cs5535 National Semiconductor Corporation, cs5535 Datasheet - Page 62

• Manufacturer Part Number: cs5535
• Description: Geode Cs5535 Companion Multi-function South Bridge
• Manufacturer: National Semiconductor Corporation

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Global Concepts and Features
Note 1. See Section 3.8 "Standard GeodeLink Device MSRs" on page 67 for register descriptions.
3.7.7
Table 3-6 details the legacy I/O range for 000h through
4FFh. Each I/O location has a read/write (R/W) capability.
Note the following abbreviations:
---
Yes
WO
RO
I/O Addr.
000h
001h
002h
003h
004h
005h
006h
007h
008h
009h
00Ah
00Bh
00Ch
00Dh
Device
DD
Legacy I/O Decoding
Unknown or can not be determined.
Read and Write the register at the indicated
location. No shadow required.
Write only. Value written can not be read back.
Reads do not contain any useful information.
Read only. Writes have no effect.
Function
Slave DMA Address - Channel 0
Slave DMA Counter - Channel 0
Slave DMA Address - Channel 1
Slave DMA Counter - Channel 1
Slave DMA Address - Channel 2
Slave DMA Counter - Channel 2
Slave DMA Address - Channel 3
Slave DMA Counter - Channel 3
Slave DMA Command/Status - Channels [3:0]
Slave DMA Request - Channels [3:0]
Slave DMA Mask - Channels [3:0]
Slave DMA Mode - Channels [3:0]
Slave DMA Clear Pointer - Channels [3:0]
Slave DMA Reset - Channels [3:0]
Standard GeodeLink Device
MSR Space (Note 1)
MSRs plus:
SMB LBAR, ACPI LBAR,
PM LBAR, GPIO LBAR,
MFGPT LBAR, NAND LBAR,
KEL LBAR, KEL LBAR,
IRQ Mapper LBAR,
Legacy Controls,
DMA Mappers,
Shadow Registers,
LPC Controls, and
Memory Mask.
NOR Flash address control.
Table 3-5. Diverse Device Space Map Except Legacy I/O
Table 3-6. Legacy I/O: 000h-4FFh
(Continued)
I/O Space
Located by associated LBAR.
Defaults disabled.
008 Bytes SMB,
016 Bytes ACPI,
064 Bytes PM Support,
256 Bytes GPIO and ICFs,
064 Bytes MFGPTs,
016 Bytes NAND Flash, and
032 Bytes IRQ Mapper.
All I/O that does not hit one of the
items above and does not hit a
legacy address, is directed to the
LPC bus.
62
Shw
Shw@ Reads of the location return a constant or
Shw$
Rec
Size
8-bit
8-bit
8-bit
8-bit
8-bit
8-bit
8-bit
8-bit
8-bit
8-bit
8-bit
8-bit
8-bit
8-bit
The value written to the register can not be read
back via the same I/O location.
Read back is accomplished via a “Shadow”
register located in MSR space.
meaningless value.
Reads of the location return a status or some
other meaningful information.
Writes to the location are “recorded” and written
to the LPC.
Reads to the location return the recorded value.
The LPC is not read.
Shw@
Shw@
Shw$
R/W
WO
WO
WO
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Comment
16-bit values in two transfers.
16-bit values in two transfers.
16-bit values in two transfers.
16-bit values in two transfers.
16-bit values in two transfers.
16-bit values in two transfers.
16-bit values in two transfers.
16-bit values in two transfers.
Reads return value B2h.
Reads return value B2h.
Reads return value B2h.
Reads return value B2h.
Reads return value B2h.
Memory Space
16-Byte KEL Host Controller reg-
ister set at LBAR. Defaults dis-
abled.
NOR Flash per LBAR.
All other memory accesses are
directed to the LPC bus.
Revision 0.8